Search found 151 matches

by jmc2000
Sun Jun 03, 2018 11:42 pm
Forum: The Accelerator
Topic: 2018 Operation
Replies: 69
Views: 5723

Re: 2018 Operation

134th LHCC Meeting - Agenda OPEN Session
https://indico.cern.ch/event/726320/

Aiming for ~60\fb for 2018

JMc
by jmc2000
Sun May 20, 2018 11:48 pm
Forum: The Accelerator
Topic: Looking ahead to LS2 and Run 3
Replies: 2
Views: 232

Re: Looking ahead to LS2 and Run 3

Interesting; I thought the plan a few years back was to accumulate ~300\fb over run3, whereas now it seems to be little better than what's already possible ~150-200\fb

JMc
by jmc2000
Tue May 15, 2018 1:08 am
Forum: The Accelerator
Topic: 2018 Operation
Replies: 69
Views: 5723

Re: 2018 Operation

I think the aim is to achieve 150\fb in total for 2015-2018, working out at approx 60\fb for 2018, and making Run 2 a great success even if nothing else has been discovered since the Higgs. Currently averaging 4\fb/week, I can see this being achieved by the start of MD3; so perhaps the remaining tim...
by jmc2000
Tue May 01, 2018 11:52 pm
Forum: The Accelerator
Topic: 2018 Operation
Replies: 69
Views: 5723

Re: 2018 Operation

The 2018 data-taking run at the LHC has begun: https://home.cern/about/updates/2018/04/2018-data-taking-run-lhc-has-begun The LHC operators will keep ramping up the number of bunches, aiming to hit 2556 bunches in total. This will help them achieve their target of 60 inverse femtobarns (fb-1) of pro...
by jmc2000
Thu Mar 29, 2018 9:13 pm
Forum: The Accelerator
Topic: 2018 Operation
Replies: 69
Views: 5723

Re: 2018 Operation

Late February LHCC meeting: https://indico.cern.ch/event/692482/contributions/2841711/attachments/1608028/2552349/LHCC133_Machine_Status.pdf Looks as if the number of days for the p-p run has been reduced from 131 to 124 to accommodate special runs: https://beams.web.cern.ch/sites/beams.web.cern.ch/...
by jmc2000
Mon Oct 02, 2017 10:24 pm
Forum: The Accelerator
Topic: 2017 Operation
Replies: 72
Views: 9789

Re: 2017 Operation

Schedule has been updated: https://beams.web.cern.ch/sites/beams.web.cern.ch/files/schedules/LHC_Schedule_2017.pdf It looks as if they've reallocated two weeks from the proton-proton run to 5 TeV p-p Reference & Low Energy High Beta run. Currently hitting > 3\fb/week so ~ 45\fb for the remaining 7 w...
by jmc2000
Thu Sep 14, 2017 5:30 pm
Forum: The Accelerator
Topic: 2017 Operation
Replies: 72
Views: 9789

Re: 2017 Operation

Latest 131st LHCC meeting has 45\fb as year end target :
https://indico.cern.ch/event/658856/con ... pt2017.pdf

JMc
by jmc2000
Wed Aug 30, 2017 11:37 pm
Forum: The Accelerator
Topic: 2017 Operation
Replies: 72
Views: 9789

Re: 2017 Operation

https://home.cern/cern-people/updates/2017/08/lhc-report-something-nothing "On the basis of current statistics, there appears to be no direct correlation between the number of bunches and the number of beam dumps, so the task force is now planning tests with beams of up to 2200 bunches (last year’s ...
by jmc2000
Tue Aug 29, 2017 6:33 pm
Forum: The Accelerator
Topic: 2017 Operation
Replies: 72
Views: 9789

Re: 2017 Operation

So running with the current 1550b yields 0.3\fb/day = 2\fb/week at 55% efficiency giving 35 - 40\fb for 2017 which looks fine to me, bearing in mind that the hope was to accumulate > 100\fb for run 2. I don't see the point in changing the planned running parameters of the LHC significantly, just for...
by jmc2000
Mon Aug 28, 2017 7:06 pm
Forum: The Accelerator
Topic: 2017 Operation
Replies: 72
Views: 9789

Re: 2017 Operation

Interesting... so am I right in saying that the beam can heat the pipe via inductive heating, thus releasing any frozen gas, and temporary failing of the cryogenics then adds to the problem as the frozen gas is heated? This makes sense because the problem seemed to go away for a while as they gradua...
by jmc2000
Wed Aug 16, 2017 5:21 pm
Forum: The Accelerator
Topic: 2017 Operation
Replies: 72
Views: 9789

Re: 2017 Operation

They've moved from 144bpi to 96bpi which looks interesting... perhaps the lower bpi are more efficient in scrubbing the injectors and minimizing loses?

JMc
by jmc2000
Tue Aug 15, 2017 2:33 pm
Forum: The Accelerator
Topic: 2017 Operation
Replies: 72
Views: 9789

Re: 2017 Operation

Does anyone know why, for the past week, they're having to slowly ramp up the intensity again?

Jmc
by jmc2000
Fri Aug 11, 2017 5:01 pm
Forum: The Accelerator
Topic: 2017 Operation
Replies: 72
Views: 9789

Re: 2017 Operation

They were trying for increased bunch intensity, but lost the beam several times upon ramping; so I guess the scrubbing is to "clean" the beam path in the hope this will improve things.

JMc
by jmc2000
Sun Aug 06, 2017 1:05 am
Forum: The Accelerator
Topic: 2017 Operation
Replies: 72
Views: 9789

Re: 2017 Operation

Atlas currently recording o.5\fb every 13 hours giving >3.5\fb per week for 55% beam time

JMc
by jmc2000
Thu Jul 20, 2017 8:53 pm
Forum: The Accelerator
Topic: 2017 Operation
Replies: 72
Views: 9789

Re: 2017 Operation

At one point they managed a new instantaneous luminosity record of 1.65\nb/s, but dumped an hour later because of losses. 1.7\nb/s is the aim this year for beta = 40cm, 1.9\nb/s for beta = 33cm.

JMc